21256054353530 has 32 divisors (see below), whose sum is σ = 38838449388096. Its totient is φ = 8374119393024.

The previous prime is 21256054353517. The next prime is 21256054353551. The reversal of 21256054353530 is 3535345065212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1361762 + ... + 6660818.

It is an arithmetic number, because the mean of its divisors is an integer number (1213701543378).

Almost surely, 2^{21256054353530} is an apocalyptic number.

21256054353530 is a deficient number, since it is larger than the sum of its proper divisors (17582395034566).

21256054353530 is a wasteful number, since it uses less digits than its factorization.

21256054353530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5305118.

The product of its (nonzero) digits is 1620000, while the sum is 44.

The spelling of 21256054353530 in words is "twenty-one trillion, two hundred fifty-six billion, fifty-four million, three hundred fifty-three thousand, five hundred thirty".